Containment of fire near Yosemite National Park increases

The Rim Fire burns through trees near Yosemite National Park, Calif., on Tuesday, Aug. 27, 2013. Firefighters gained some ground Tuesday against the huge wildfire burning forest lands in the western Sierra Nevada, including parts of Yosemite National Park. (AP Photo/Jae C. Hong)

Two firefighters monitor a back burn during the Rim Fire near Yosemite National Park, Calif., on Tuesday, Aug. 27, 2013. Unnaturally long intervals between wildfires and years of drought primed the Sierra Nevada for the explosive conflagration chewing up the rugged landscape on the edge of Yosemite National Park, forestry experts say. The fire had ravaged 282 square miles by Tuesday, the biggest in the Sierra's recorded history and one of the largest on record in California. (AP Photo/Jae C. Hong)

Firefighter Brandon Wenger stands along Highway 120 while monitoring a backburn during the Rim Fire near Yosemite National Park, Calif., on Tuesday, Aug. 27, 2013. Unnaturally long intervals between wildfires and years of drought primed the Sierra Nevada for the explosive conflagration chewing up the rugged landscape on the edge of Yosemite National Park, forestry experts say. The fire had ravaged 282 square miles by Tuesday, the biggest in the Sierra's recorded history and one of the largest on record in California. (AP Photo/Jae C. Hong)

Firefighter Brandon Wenger stands along Highway 120 while monitoring a backburn during the Rim Fire near Yosemite National Park, Calif., on Tuesday, Aug. 27, 2013. Unnaturally long intervals between wildfires and years of drought primed the Sierra Nevada for the explosive conflagration chewing up the rugged landscape on the edge of Yosemite National Park, forestry experts say. The fire had ravaged the largest area in the Sierra's recorded history and one of the largest on record in California. (AP Photo/Jae C. Hong)

In this photo provided by the National Park Service, a Merced Grove cabin, next to the giant sequoias, is covered in metal foil by CalFire crews trying to protect structures from the Rim Fire burning through trees near Yosemite National Park, Calif., on Tuesday, Aug. 27, 2013. Firefighters gained some ground Tuesday against the huge wildfire burning forest lands in the western Sierra Nevada, including parts of Yosemite National Park. (AP Photo/National Park Service)

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GROVELAND, Calif. — Officials say fire crews aided by higher humidity overnight were able to increase containment of a giant wildfire burning at the edge of Yosemite National Park.

The U.S. Forest Service says the fire was 23 percent contained on Wednesday morning, up from 20 percent the previous day. The fire has now consumed 293 square miles.

Crews plan to focus on structure defense along the southeast edge of the fire on Wednesday and continue constructing a contingency line ahead of communities to the north, including Tuolumne City.

The fire is threatening 4,500 structures. Forest service officials have confirmed that three commercial properties and 85 tent cabins were destroyed at a camp run by the city of Berkeley, adding to the 23 structures that were previously reported as destroyed.